CN104113200B - For convertible frequency air-conditioner without bridge APFC systems and its control method - Google Patents
For convertible frequency air-conditioner without bridge APFC systems and its control method Download PDFInfo
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- CN104113200B CN104113200B CN201410312876.XA CN201410312876A CN104113200B CN 104113200 B CN104113200 B CN 104113200B CN 201410312876 A CN201410312876 A CN 201410312876A CN 104113200 B CN104113200 B CN 104113200B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses it is a kind of for convertible frequency air-conditioner without bridge APFC systems, it includes：PFC inductance；Current sampling circuit, for being sampled to generate S1 and S2 to the electric current for flowing through PFC inductance；Rectification filtering unit, rectification filtering unit includes first switch device and second switch device, and rectification filtering unit is used to that the alternating current of AC power to be carried out rectifying and wave-filtering to export the direct current of predeterminated voltage；Voltage sampling unit, is sampled to generate Vdc for the direct current to predeterminated voltage；Microcontroller, microcontroller is connected with current sampling circuit, voltage sampling unit and first switch device and second switch device respectively, and microcontroller is controlled according to S1 and S2 and Vdc and Vref generation pwm signals with to first switch device and second switch device.This can improve efficiency, reduces cost without bridge APFC systems, and the reliability of whole system is improved.The invention also discloses a kind of control method without bridge APFC systems for convertible frequency air-conditioner.
Description
Technical field
The present invention relates to convertible frequency air-conditioner technical field, it is more particularly to a kind of for convertible frequency air-conditioner without bridge APFC (Active
Power Factor Correction, without bridge passive power factor corrective) system and it is a kind of for convertible frequency air-conditioner without bridge
The control method of APFC systems.
Background technology
Convertible frequency air-conditioner is developed rapidly in recent years, and APFC technologies are because its PF value is higher, THD (Total
Harmonic Distortion, total harmonic distortion) relatively more low advantage, it is widely used in the electric control part of convertible frequency air-conditioner.
It is essentially all using same scheme, such as Fig. 1 that the AC-DC of variable frequency drives becomes stream part in current convertible frequency air-conditioner
Shown, i.e., using rectifier bridge rectification, Boost type voltage lifting PFC topology on hardware, control section uses application-specific integrated circuit, or in micro-control
Programmed on device processed and realize the control algolithm of the APFC based on multiplier.
But, from the point of view of hardware view, rectifier bridge device heating is serious, so as to the efficiency of whole machine can be reduced；APFC is special
IC such as IR1153 are expensive, and the peripheral components of application-specific integrated circuit are more, increased the complexity of circuit.From control algolithm aspect
From the point of view of, first, the APFC algorithms based on multiplier need three physical quantitys such as detection electric current, DC voltage and alternating voltage, inspection
Slowdown monitoring circuit is more, high cost；Second, the APFC algorithms based on multiplier need PWM (the Pulse Width to current zero-crossing point
Modulation, pulsewidth modulation) dutycycle of signal is compensated, but the effect on driving birds is not good of compensation；Second, based on multiplier
APFC algorithms need to carry out electric current and voltage double-closed-loop control, and operand is big, and method comparison is complicated.
The content of the invention
The purpose of the present invention is intended at least solve one of above-mentioned technological deficiency.
Therefore, it is an object of the present invention to propose it is a kind of for convertible frequency air-conditioner without bridge passive power factor corrective
APFC systems, it is possible to increase efficiency, reduces cost, and the reliability of whole system is improved.
It is another object of the present invention to propose a kind of control method without bridge APFC systems for convertible frequency air-conditioner.
To reach above-mentioned purpose, one aspect of the present invention embodiment propose it is a kind of for convertible frequency air-conditioner without bridge active power
Factor correction APFC systems, including：PFC inductance；Current sampling circuit, the current sampling circuit is used for flowing through the PFC
The electric current of inductance is sampled to generate first voltage signal and second voltage signal；Rectification filtering unit, the rectifying and wave-filtering
Unit includes first switch device and second switch device, and the rectification filtering unit is used for the exchange to the AC power being input into
Electricity carries out rectifying and wave-filtering to export the direct current of predeterminated voltage；Voltage sampling unit, the voltage sampling unit and the rectification
The output end of filter unit is connected, and the voltage sampling unit is used to sample the direct current of the predeterminated voltage to generate
DC voltage sampled signal；Microcontroller, the microcontroller respectively with the current sampling circuit, the voltage sampling unit
And the first switch device is connected with second switch device, the microcontroller is according to the first voltage signal and second
Voltage signal and the DC voltage sampled signal and DC reference voltage generate pulse-width modulation PWM signal with to described first
Switching device and second switch device are controlled.
Wherein, the microcontroller includes：AD conversion unit, the AD conversion unit is used for respectively by the first voltage
Signal, the second voltage signal and the DC voltage sampled signal are converted to first voltage AD sampled values, second voltage AD
Sampled value and DC voltage AD sampled values；Control unit, described control unit is used for the DC voltage AD sampled values and institute
Stating the difference between DC reference voltage carries out PI controls to obtain the first controlling value；Computing unit, the computing unit is used for
The PWM is calculated according to first controlling value, the first voltage AD sampled values and the second voltage AD sampled values
The count value of the dutycycle of signal；Pwm signal generation unit, duty of the pwm signal generation unit according to the pwm signal
The count value of ratio generates the pwm signal.
According to one embodiment of present invention, the computing unit calculates the duty of the pwm signal according to below equation
The count value of ratio：
Wherein, Count is the count value of the dutycycle of the pwm signal, VmIt is first controlling value, [S1] is described
First voltage AD sampled values, [S2] is the second voltage AD sampled values, and Gain is AD sampling gains, DMAXIt is maximum duty cycle
Count value.
According to one embodiment of present invention, the current sampling circuit includes：Current transformer, the current transformer
Armature winding be connected between the first end of one end of the AC power and the rectification filtering unit；Divider resistance, institute
State the two ends that divider resistance is connected in parallel on the secondary windings of the current transformer；Signal processing module, the signal processing module
The two ends with the divider resistance are connected respectively, ac voltage signal of the signal processing module to the divider resistance two ends
Processed to export the first voltage signal and second voltage signal.
Wherein, the signal processing module includes that the first processing units of the output first voltage signal and output are described
The second processing unit of second voltage signal.
Also, the first processing units are specifically included：First resistor, one end of the first resistor and partial pressure electricity
One end of resistance is connected；First amplifier, the in-phase input end of first amplifier is connected with the other end of the first resistor；
Second resistance, the second resistance is connected to the inverting input of first amplifier and the output end of first amplifier
Between, the output end of first amplifier exports the first voltage signal.The second processing unit is specifically included：3rd
Resistance, one end of the 3rd resistor is connected with the other end of the divider resistance；Second amplifier, second amplifier
In-phase input end is connected with the other end of the 3rd resistor；4th resistance, the 4th resistance is connected to described second and amplifies
Between the output end of the inverting input of device and second amplifier, the output end output described second of second amplifier
Voltage signal.
According to one embodiment of present invention, the power supply of first amplifier and second amplifier is using single
One positive supply.
In an embodiment of the present invention, the PFC inductance connections are filtered in the other end of the AC power with the rectification
Between second end of ripple unit.
According to one embodiment of present invention, also include：Current foldback circuit, the current foldback circuit and the electric current
Sample circuit is connected, the current foldback circuit according to the first voltage signal and second voltage signal generation protection signal with
Shut-off is input to the pwm signal of the first switch device and second switch device.
Wherein, the current foldback circuit includes：First comparator, positive input terminal and the reference electricity of the first comparator
Pressure is connected, and the negative input end of the first comparator is connected with the output end of first amplifier；Second comparator, described
The positive input terminal of two comparators is connected with the reference voltage, the negative input end of second comparator and second amplifier
Output end be connected, the output end of second comparator is connected to export the protection with the output end of the first comparator
Signal；Over-current protecting unit, the output end of the over-current protecting unit and the first comparator and second comparator
Output end is connected, and the over-current protecting unit is input to the first switch device and second and opens according to protection signal shut-off
Close the pwm signal of device.
According to one embodiment of present invention, the microcontroller also with the output end of the first comparator and described
The output end of two comparators is connected, and the microcontroller turns off the output of the pwm signal according to the protection signal.
It is according to embodiments of the present invention for convertible frequency air-conditioner without bridge APFC systems, the rectifying part in rectification filtering unit
With PFC units on hardware common switch device such as IGBT and fast recovery diode, so as to eliminate rectifier bridge device, drop
It is low because rectifier bridge diode is opened and closes the heating loss for producing, the electrical efficiency that can improve whole convertible frequency air-conditioner is e.g., from about carried
It is high 1.5 percentage points, greatly save power consumption；Meanwhile, rectification filtering unit employs two switching device such as IGBT, point
Switching loss during traditional only one of which IGBT is spread out, the heating temperature rise of each IGBT has obtained good improvement, effectively carried
The reliability and stability of whole circuit high, although increased the cost of IGBT and fast recovery diode, but can be whole by omitting
Stream bridge, the detection circuit of alternating voltage are offset；Also, can be led to using the inductive current Sampling introduced without bridge topology
The current sampling circuits such as overcurrent transformer can be solved well；Additionally, the embodiment of the present invention without bridge APFC systems
In microcontroller using digitlization APFC algorithms, it is simple and easy to apply compared to traditional double-closed-loop control algorithm based on multiplier,
And be desirably integrated into the program of the Master control chip of convertible frequency air-conditioner, so that expensive application-specific integrated circuit and its circuit can be omitted,
Greatly reduce cost.Finally, can be turned off when overcurrent occurs in whole circuit by current foldback circuit and be input to switch
The pwm signal of device, the purpose of whole circuit is protected to reach, and improves the reliability of whole circuit.
To reach above-mentioned purpose, another aspect of the present invention embodiment propose it is a kind of for convertible frequency air-conditioner without bridge APFC systems
The control method of system, it is described without bridge APFC systems include PFC inductance and for be input into AC power alternating current carry out it is whole
Stream is filtered to export the galvanic rectification filtering unit of predeterminated voltage, wherein the rectification filtering unit includes first switch device
Part and second switch device, the control method are comprised the following steps：Electric current to flowing through the PFC inductance is sampled with life
Into first voltage signal and second voltage signal；Direct current to the predeterminated voltage is sampled to generate DC voltage sampling
Signal；According to the first voltage signal and second voltage signal and the DC voltage sampled signal and DC reference voltage
Generation pulse-width modulation PWM signal is controlled with to the first switch device and second switch device.
According to one embodiment of present invention, the generation pwm signal, specifically includes：The first voltage is believed respectively
Number, the second voltage signal and the DC voltage sampled signal be converted to first voltage AD sampled values, second voltage AD and adopt
Sample value and DC voltage AD sampled values；Difference between the DC voltage AD sampled values and the DC reference voltage is carried out
PI controls to obtain the first controlling value；According to first controlling value, the first voltage AD sampled values and the second voltage
AD sampled values are calculated the count value of the dutycycle of the pwm signal；The count value life of the dutycycle according to the pwm signal
Into the pwm signal.
Wherein, the count value of the dutycycle of the pwm signal is calculated according to below equation：
Wherein, Count is the count value of the dutycycle of the pwm signal, VmIt is first controlling value, [S1] is described
First voltage AD sampled values, [S2] is the second voltage AD sampled values, and Gain is AD sampling gains, DMAXIt is maximum duty cycle
Count value.
According to one embodiment of present invention, also include：According to the first voltage signal and second voltage signal generation
Protection signal, and the PWM of the first switch device and second switch device is input to according to protection signal shut-off
Signal.
The control method without bridge APFC systems for convertible frequency air-conditioner according to embodiments of the present invention, using digitlization APFC
Algorithm, it is simple and easy to apply, it is possible to be integrated into the master control of convertible frequency air-conditioner compared to traditional double-closed-loop control algorithm based on multiplier
In the program of coremaking piece, so as to expensive application-specific integrated circuit and its circuit can be omitted, cost is greatly reduced.And can be whole
Shut-off is input to the pwm signal of switching device when overcurrent occurs in individual circuit, and the purpose of whole circuit is protected to reach, and improves
The reliability of whole circuit.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by practice of the invention.
Brief description of the drawings
The above-mentioned and/or additional aspect of the present invention and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and be readily appreciated that, wherein：
Fig. 1 is the existing circuit diagram without bridge APFC systems；
Fig. 2 is the circuit diagram without bridge APFC systems for convertible frequency air-conditioner according to the embodiment of the present invention；
Fig. 3 is ac voltage signal S0, the first electricity obtained according to the current sampling circuit sampling of one example of the present invention
Press the oscillogram of signal S1 and second voltage signal S2；
Fig. 4 is the theory diagram of the digitlization APFC algorithms according to one embodiment of the invention；
Fig. 5 is the flow chart of the control method without bridge APFC systems for convertible frequency air-conditioner according to the embodiment of the present invention；
And
Fig. 6 is to calculate pwm signal by triggering interrupt service routine according to the microcontroller of one embodiment of the invention
Flow chart.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
It is exemplary to scheme the embodiment of description, is only used for explaining the present invention, and is not construed as limiting the claims.
Following disclosure provides many different embodiments or example is used for realizing different structure of the invention.For letter
Change disclosure of the invention, hereinafter the part and setting to specific examples are described.Certainly, they are only merely illustrative, and
Purpose does not lie in the limitation present invention.Additionally, the present invention can in different examples repeat reference numerals and/or letter.It is this heavy
It is again the relation between itself not indicating discussed various embodiments and/or setting for purposes of simplicity and clarity.This
Outward, the invention provides various specific technique and material example, but those of ordinary skill in the art can be appreciated that
The use of the applicable property and/or other materials of other techniques.In addition, fisrt feature described below second feature it
" on " structure can include that the first and second features be formed as the embodiment of directly contact, it is also possible to including other feature shape
Into the embodiment between the first and second features, such first and second feature may not be directly contact.
In the description of the invention, it is necessary to explanation, unless otherwise prescribed and limit, term " installation ", " connected ",
" connection " should be interpreted broadly, for example, it may be mechanically connect or electrical connection, or two connections of element internal, can
Being to be joined directly together, it is also possible to be indirectly connected to by intermediary, for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term.
With reference to the accompanying drawings come describe proposition according to embodiments of the present invention for convertible frequency air-conditioner without bridge APFC systems with
And the control method without bridge APFC systems.
Fig. 2 is the circuit diagram without bridge APFC systems for convertible frequency air-conditioner according to the embodiment of the present invention.Such as Fig. 2 institutes
Show, this is used for including without bridge APFC systems for convertible frequency air-conditioner：PFC inductance L1, current sampling circuit 10, rectification filtering unit 200,
Voltage sampling unit 300 and microcontroller 400.Also, this is without bridge APFC systems also including AC power 100, and convertible frequency air-conditioner
Also include inverter 500 and frequency-changeable compressor M.
Wherein, rectification filtering unit 200 includes first switch device such as IGBT1 and second switch device such as IGBT2,
The alternating current that rectification filtering unit 200 is used for the AC power 100 to being input into carries out rectifying and wave-filtering to export the straight of predeterminated voltage
Stream electricity, supplies direct current major loop.Also, the rectifying part in rectification filtering unit 200 using non-bridge PFC topology, by the use of as
The switching device of PFC units such as IGBT1 and IGBT2 built-in fly-wheel diode constitutes whole with fast recovery diode D1, D2
Stream full-bridge, therefore, the rectifying part in rectification filtering unit shares two poles of IGBT and fast recovery with PFC units on hardware
Pipe, so as to eliminate rectifier bridge device.
In an embodiment of the present invention, current sampling circuit 10 be used to sampling the electric current that flows through PFC inductance L1 with
Generation first voltage signal S1 and second voltage signal S2.Specifically, as shown in Fig. 2 current sampling circuit 10 includes：Electric current is mutual
Sensor T1, divider resistance R0 and signal processing module 101.The armature winding of current transformer T1 is connected to AC power 100
Between the first end 1 of one end A and rectification filtering unit 200, divider resistance R0 is connected in parallel on the secondary windings of current transformer T1
Two ends, so, when whole convertible frequency air-conditioner normally runs without bridge APFC systems, the electric current flowed through in PFC inductance L1 is equal to
The electric current of current transformer T1 armature windings is flowed through, and by after current transformer T1 sensings, being produced in the secondary coil of T1
The current signal of primary winding current size is proportional to, and then the ac voltage signal of linear scale is produced on divider resistance R0
S0.According to the principle and Ohm's law of transformer, as long as the umber of turn of current transformer T1 is than the resistance one of certain and R0
Fixed, then the size of ac voltage signal S0 values is proportional to the current value for flowing through PFC inductance L1, and the polarity of ac voltage signal S0
PFC inductance L1 senses of current are flowed through in reflection.
Two ends of the signal processing module 101 respectively with divider resistance R0 are connected, and signal processing module 101 is to divider resistance R0
The ac voltage signal S0 at two ends is processed to export first voltage signal S1 and second voltage signal S2.Specifically, such as
Shown in Fig. 2, signal processing module 101 includes the first processing units 1011 of output first voltage signal S1 and output second voltage
The second processing unit 1012 of signal S2.
Also, as shown in Fig. 2 first processing units 1011 are specifically included：First resistor R1, the first amplifier OP1 and
Two resistance R2.One end of first resistor R1 is connected with one end of divider resistance R0, the in-phase input end of the first amplifier OP1 and
The other end of one resistance R1 is connected, and second resistance R2 is connected to the inverting input and the first amplifier OP1 of the first amplifier OP1
Output end between, the output end of the first amplifier OP1 output first voltage signal S1.
As shown in Fig. 2 second processing unit 1012 is specifically included：3rd resistor R3, the second amplifier OP2 and the 4th resistance
R4.One end of 3rd resistor R3 is connected with the other end of divider resistance R0, the in-phase input end of the second amplifier OP2 and the 3rd electricity
The other end for hindering R3 is connected, and the inverting input that the 4th resistance R4 is connected to the second amplifier OP2 is defeated with the second amplifier OP2
Go out between end, the output end output second voltage signal S2 of the second amplifier OP2.
According to one embodiment of present invention, the power supply of the first amplifier OP1 and the second amplifier OP2 is using single
Positive supply.As shown in Fig. 2 the power supply of the first amplifier OP1 and the second amplifier OP2 can with current foldback circuit in
Comparator CP1, CP2 and the power sharing of the control section without bridge APFC systems, i.e., Vcc and control ground shown in Fig. 2, with
This is come to ensure the output signal of amplifier be all positive relative to the polarity on control ground.Wherein, the representative value of Vcc can be positive 5
Volt, or be positive 3.3 volts.
Wherein, the first amplifier OP1 works in scaling pattern, the second amplifier OP2 with same gain scale and
Mode of operation is operated.Also, in an embodiment of the present invention, first voltage signal S1 can be it is scaling after exchange
The positive half cycle waveform of voltage signal S0, second voltage signal S2 can be it is scaling after ac voltage signal S0 negative half period
Waveform.
In an embodiment of the present invention, negative busbar of the power supply of the control section without the bridge APFC systems ground with direct current major loop
Altogether, the purpose for so setting is to isolate component with cost-effective between light current ground with omitting forceful electric power.But it is foregoing
Voltage signal S0 for the electric current for flowing through PFC inductance L1 is an alternating signal, it is therefore desirable to ac voltage signal S0 realities
Rectification is applied, that is, is sayed, current sampling signal is obtained by the treatment of signal processing module 101 and microcontroller 400.And without bridge
The control section of APFC systems requires that current sampling signal is all positive relative to the polarity on control ground.
Specifically, when ac voltage signal S0 is in positive half cycle, the current potential in divider resistance R0 one end is higher than control unit
During the reference zero potential divided, the first amplifier OP1 can just carry out scaling to the half-cycle signal of ac voltage signal S0
And export first voltage signal S1；Equally, the second amplifier OP2 processes another half cycles shape of ac voltage signal S0 and exports
Second voltage signal S2.First voltage signal S1 and second voltage signal S2 is by after superposition, just having obtained ac voltage signal
Absolute value | S0 | of S0, i.e., equivalent to full-wave rectification is carried out to S0, signal | S0 | can be used as current sampling signal by without bridge
The control section of APFC systems uses.An example of the invention, the alternating voltage letter that current sampling circuit sampling is obtained
The waveform of number S0, first voltage signal S1 and second voltage signal S2 is as shown in Figure 3.
In an embodiment of the present invention, as shown in Fig. 2 PFC inductance L1 be connected to the other end B of AC power 100 with it is whole
Between second end 2 of stream filter unit 200.Therefore, PFC inductance L1 is placed on the input of rectification filtering unit 200, rather than
In the direct current major loop being positioned over after rectification universal at present.
As shown in Fig. 2 voltage sampling unit 300 is connected with the output end of rectification filtering unit 200, voltage sampling unit
300 are sampled to generate DC voltage sampled signal Vdc for the voltage that the direct current to predeterminated voltage is dc bus；It is micro-
Controller 400 respectively with current sampling circuit 10, voltage sampling unit 300 and first switch device such as IGBT1 and second
Switching device such as IGBT2 is connected, and microcontroller 400 is according to first voltage signal S1 and second voltage signal S1 and direct current
Pressure sampled signal Vdc and DC reference voltage Vref generates pulse-width modulation PWM signal with to first switch device and second switch
Device is controlled, that is, control being switched on or off for IGBT1 and IGBT2.
According to one embodiment of present invention, as shown in Figure 2 and Figure 4, microcontroller 400 includes：AD conversion unit 401,
Control unit 402, computing unit 403 and pwm signal generation unit 404.Wherein, AD conversion unit 401 is used for respectively by first
Voltage signal S1, second voltage signal S2 and DC voltage sampled signal Vdc are converted to first voltage AD sampled values [S1], second
Voltage AD sampled values [S2] and DC voltage AD sampled values [Vdc]；Control unit 402 is used for DC voltage AD sampled values
Difference between [Vdc] and DC reference voltage Vref carries out PI controls to obtain the first controlling value Vm；Computing unit 403 is used for
Pwm signal is calculated according to the first controlling value Vm, first voltage AD sampled values [S1] and second voltage AD sampled values [S2]
The count value of dutycycle；Pwm signal generation unit 404 generates the PWM letters according to the count value of the dutycycle of the pwm signal
Number.
Wherein, computing unit 403 calculates the count value of the dutycycle of the pwm signal according to below equation：
Wherein, Count is the count value of the dutycycle of the pwm signal, VmIt is first controlling value, [S1] is described
First voltage AD sampled values, [S2] is the second voltage AD sampled values, and Gain is AD sampling gains, DMAXIt is maximum duty cycle
Count value.
That is, in an embodiment of the present invention, microcontroller 400 samples the electricity of dc bus by converter
Pressure [Vdc], first voltage AD sampled values [S1] and second voltage AD sampled values [S2], it is then real-time by digitizing APFC algorithms
The dutycycle of suitable pwm signal is calculated, to realize APFC functions, therefore the alternating voltage of AC power need not be gathered.By
It is a kind of typical digitlization actuator in microcontroller, the APFC algorithms that it is used are with certain frequency, by timing
What the mode of disconnected program was periodically carried out.Wherein, digitlization APFC algorithms can be by the form of software program in microcontroller
Control chip in realize.
Because the frequency of AC power is most commonly that 50Hz and 60Hz, in order to ensure that it is preferable that digitlization APFC algorithms have
Resolution ratio and control sensitivity, the carrier frequency of usual PWM is in more than 15KHz, and the algorithm operation frequency of microcontroller is logical
Often it is equal to carrier frequency or its two divided-frequency, namely each or two PWM cycles are calculated and refresh pwm signal
Dutycycle.Wherein, it is the computational burden of reduction microcontroller, the operation frequency of APFC algorithms can be set to 8KHz to 16KHz
Between.
According to one embodiment of present invention, as shown in Fig. 2 above-mentioned also wraps for convertible frequency air-conditioner without bridge APFC systems
Include：Current foldback circuit 20, current foldback circuit 20 is connected with current sampling circuit 10, and current foldback circuit 20 is according to the first electricity
Pressure signal S1 and second voltage signal S2 generation protection signals are input to first switch device such as IGBT1 and second and open to turn off
Close the pwm signal of device such as IGBT2.
Wherein, current foldback circuit 20 may include：First comparator CP1, the second comparator CP2 and over-current protecting unit
201.The positive input terminal of first comparator CP1 is connected with reference voltage S3, and the negative input end of first comparator CP1 and first amplifies
The output end of device OP1 is connected；The positive input terminal of the second comparator CP2 is connected with reference voltage S3, and the second comparator CP2's is negative defeated
Enter end to be connected with the output end of the second amplifier OP2, the output end of the second comparator CP2 and the output end of first comparator CP1
It is connected with output protection signal S4；The output end and the second comparator CP2 of over-current protecting unit 201 and first comparator CP1
Output end is connected, and over-current protecting unit 201 is input to the first switch device and second switch according to protection signal S4 shut-offs
The pwm signal of device.
According to one embodiment of present invention, as shown in Fig. 2 current foldback circuit 20 also includes that reference voltage provides unit
202, reference voltage provide unit 202 include series connection the 5th resistance R5 and the 6th resistance R6, one end of the 5th resistance R5 with it is pre-
If the power Vcc that power supply is the above-mentioned control section without bridge APFC systems is connected, the other end and the 6th resistance of the 5th resistance R5
One end of R6 is connected and with first node, and the other end ground connection of the 6th resistance R6 is attached to control ground, wherein, first node
Output reference voltage S3.
In sum, in an embodiment of the present invention, first voltage signal S1 and second voltage signal S2 are additionally operable to excessively stream
In protection circuit 20.As shown in Fig. 2 the 5th resistance R5 and the 6th resistance R6 are connected between control power Vcc and control ground, lead to
Cross resistance value ratio and obtain a constant voltage signal S3 i.e. reference voltage.S3 correspond to the overcurrent protective valve without bridge APFC systems
Value, i.e., when the current value flowed through in PFC inductance L1 exceed this threshold values when by turn off pwm signal come thoroughly turn off IGBT1 and
IGBT2, now APFC function stops.Overcurrent protection function by first voltage signal S1 and second voltage signal S2 respectively with ginseng
Voltage S3 is examined relatively to complete.Any instant when the value of the value higher than S3 of S1 or S2, then corresponding comparator CP1 or CP2
Output protection signal S4 will be low level by high level upset, so that it is defeated that over-current protecting unit 201 closes pwm signal at once
Go out, reach the purpose for protecting whole circuit.
It should be noted that the trigger signal that the energizing signal of this level can be acted as protection circuit, is this area
Well known to technical staff, i.e. protection signal S4 can be imported into the digital circuit i.e. overcurrent protection list being made up of digital logic gate
Unit, the pwm signal for driving IGBT is reliably turned off by the gate of digital circuit.
According to one embodiment of present invention, as shown in Fig. 2 microcontroller 400 also with the output end of first comparator CP1
Output end with the second comparator CP2 is connected, and microcontroller 400 turns off the output of the pwm signal according to the protection signal,
Pwm signal is turned off by the interrupt service routine in microcontroller 400.Therefore, when the current value flowed through in PFC inductance L1 is super
Can be that interruption in current foldback circuit 20 and software i.e. microcontroller 400 services journey by hardware when going out overcurrent protection threshold values
Sequence dual mode turns off pwm signal, substantially increases the reliability of circuit.
It is according to embodiments of the present invention for convertible frequency air-conditioner without bridge APFC systems, the rectifying part in rectification filtering unit
With PFC units on hardware common switch device such as IGBT and fast recovery diode, so as to eliminate rectifier bridge device, drop
It is low because rectifier bridge diode is opened and closes the heating loss for producing, the electrical efficiency that can improve whole convertible frequency air-conditioner is e.g., from about carried
It is high 1.5 percentage points, greatly save power consumption；Meanwhile, rectification filtering unit employs two switching device such as IGBT, point
Switching loss during traditional only one of which IGBT is spread out, the heating temperature rise of each IGBT has obtained good improvement, effectively carried
The reliability and stability of whole circuit high, although increased the cost of IGBT and fast recovery diode, but can be whole by omitting
Stream bridge, the detection circuit of alternating voltage are offset；Also, can be led to using the inductive current Sampling introduced without bridge topology
The current sampling circuits such as overcurrent transformer can be solved well；Additionally, the embodiment of the present invention without bridge APFC systems
In microcontroller using digitlization APFC algorithms, it is simple and easy to apply compared to traditional double-closed-loop control algorithm based on multiplier,
And be desirably integrated into the program of the Master control chip of convertible frequency air-conditioner, so that expensive application-specific integrated circuit and its circuit can be omitted,
Greatly reduce cost.Finally, can be turned off when overcurrent occurs in whole circuit by current foldback circuit and be input to switch
The pwm signal of device, the purpose of whole circuit is protected to reach, and improves the reliability of whole circuit.
Fig. 5 is the flow chart of the control method without bridge APFC systems for convertible frequency air-conditioner according to the embodiment of the present invention.
Wherein, this be used for convertible frequency air-conditioner without bridge APFC systems be the above embodiment of the present invention description without bridge APFC systems, it includes
PFC inductance and the alternating current for the AC power to being input into carry out rectifying and wave-filtering to export the galvanic rectification of predeterminated voltage
Filter unit, wherein the rectification filtering unit includes first switch device and second switch device.As shown in figure 5, this is used for
The control method without bridge APFC systems of convertible frequency air-conditioner is comprised the following steps：
S1, the electric current to flowing through PFC inductance is sampled to generate first voltage signal and second voltage signal.
S2, the direct current to predeterminated voltage is sampled to generate DC voltage sampled signal.
S3, according to first voltage signal and second voltage signal and DC voltage sampled signal and DC reference voltage life
It is controlled with to first switch device and second switch device into pulse-width modulation PWM signal.
According to one embodiment of present invention, in step s3, the generation pwm signal, specifically includes：Respectively will be described
First voltage signal, the second voltage signal and the DC voltage sampled signal are converted to first voltage AD sampled values,
Two voltage AD sampled values and DC voltage AD sampled values；To between the DC voltage AD sampled values and the DC reference voltage
Difference carry out PI control to obtain the first controlling value；According to first controlling value, the first voltage AD sampled values and institute
State the count value that second voltage AD sampled values are calculated the dutycycle of the pwm signal；According to the dutycycle of the pwm signal
Count value generate the pwm signal.
Wherein, the count value of the dutycycle of the pwm signal is calculated according to below equation：
Wherein, Count is the count value of the dutycycle of the pwm signal, VmIt is first controlling value, [S1] is described
First voltage AD sampled values, [S2] is the second voltage AD sampled values, and Gain is AD sampling gains, DMAXIt is maximum duty cycle
Count value.
Specifically, in an embodiment of the present invention, pwm signal is calculated by digitizing APFC algorithms, wherein, digitlization
The principle of APFC algorithms is as shown in Figure 4.After the completion of AD samplings each time, usual microcontroller can all trigger interruption service journey
Sequence, as shown in fig. 6, the flow that microcontroller calculates pwm signal by triggering interrupt service routine is comprised the following steps：
S601, interrupt service routine starts, and performs step S602 and S604.
S602, calculate direct current voltage error, that is, calculate DC voltage AD sampled values [Vdc] with DC reference voltage Vref it
Between difference, then perform step S603；
S603, PI controls are carried out by direct current voltage error, obtain the i.e. In of the first controlling value Vm [1], then perform step
Rapid S606.
S604, first voltage AD sampled values [S1] and second voltage AD sampled values [S2] are overlapped.
S605, by superposition after [S1]+[S2] be multiplied by AD sampling gain G ain obtain In [2].
S606, calculatesObtain dutycycle Duty.
S607, maximum duty cycle count value D is multiplied by by dutycycle DutyMAXObtain the count value of the dutycycle of pwm signal
Count。
S608, by the PWM counters in the count value Count write-in microcontrollers of epicycle.
S609, new pwm signal is automatically generated according to count value Count.
S610, interrupts and returns.
According to one embodiment of present invention, the above-mentioned control method without bridge APFC systems for convertible frequency air-conditioner, also
Including：According to the first voltage signal and second voltage signal generation protection signal, and turned off according to the protection signal defeated
Enter the pwm signal to the first switch device and second switch device.Wherein, can be current foldback circuit by hardware
Being the interrupt service routine dual mode in microcontroller with software turns off pwm signal, substantially increases the reliability of circuit.
The control method without bridge APFC systems for convertible frequency air-conditioner according to embodiments of the present invention, using digitlization APFC
Algorithm, it is simple and easy to apply, it is possible to be integrated into the master control of convertible frequency air-conditioner compared to traditional double-closed-loop control algorithm based on multiplier
In the program of coremaking piece, so as to expensive application-specific integrated circuit and its circuit can be omitted, cost is greatly reduced.And can be whole
Shut-off is input to the pwm signal of switching device when overcurrent occurs in individual circuit, and the purpose of whole circuit is protected to reach, and improves
The reliability of whole circuit.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described
Point is contained at least one embodiment of the invention or example.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.And, the specific features of description, structure, material or feature can be any
One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding can carry out various changes, modification, replacement to these embodiments without departing from the principles and spirit of the present invention
And modification, the scope of the present invention is by appended claims and its equivalent limits.
Claims (15)
1. it is a kind of for convertible frequency air-conditioner without bridge passive power factor corrective APFC systems, it is characterised in that including：
PFC inductance；
Current sampling circuit, the current sampling circuit is used to sampling the electric current that flows through the PFC inductance to generate the
One voltage signal and second voltage signal, wherein, the current sampling circuit includes：
Current transformer, the armature winding of the current transformer be connected to AC power one end and rectification filtering unit
Between one end；
Divider resistance, the divider resistance is connected in parallel on the two ends of the secondary windings of the current transformer；
Signal processing module, two ends of the signal processing module respectively with the divider resistance are connected, the signal transacting mould
Block is processed the ac voltage signal at the divider resistance two ends to be believed with exporting the first voltage signal and second voltage
Number；
Rectification filtering unit, the rectification filtering unit includes first switch device and second switch device, the rectifying and wave-filtering
The alternating current that unit is used for the AC power to being input into carries out rectifying and wave-filtering to export the direct current of predeterminated voltage；
Voltage sampling unit, the voltage sampling unit is connected with the output end of the rectification filtering unit, the voltage sample
Unit is used to that the direct current of the predeterminated voltage to be sampled to generate DC voltage sampled signal；
Microcontroller, the microcontroller respectively with the current sampling circuit, the voltage sampling unit and described first
Switching device is connected with second switch device, the microcontroller according to the first voltage signal and second voltage signal and
The DC voltage sampled signal and DC reference voltage generation pulse-width modulation PWM signal are with to the first switch device and the
Two switching devices are controlled.
2. as claimed in claim 1 for convertible frequency air-conditioner without bridge passive power factor corrective APFC systems, it is characterised in that
The microcontroller includes：
AD conversion unit, the AD conversion unit is used for respectively by the first voltage signal, the second voltage signal and institute
State DC voltage sampled signal and be converted to first voltage AD sampled values, second voltage AD sampled values and DC voltage AD sampled values；
Control unit, described control unit is used for the difference between the DC voltage AD sampled values and the DC reference voltage
Value carries out PI controls to obtain the first controlling value；
Computing unit, the computing unit is used for according to first controlling value, the first voltage AD sampled values and described the
Two voltage AD sampled values are calculated the count value of the dutycycle of the pwm signal；
Pwm signal generation unit, the count value generation institute of dutycycle of the pwm signal generation unit according to the pwm signal
State pwm signal.
3. as claimed in claim 2 for convertible frequency air-conditioner without bridge passive power factor corrective APFC systems, it is characterised in that
The computing unit calculates the count value of the dutycycle of the pwm signal according to below equation：
Wherein, Count is the count value of the dutycycle of the pwm signal, VmIt is first controlling value, [S1] is described first
Voltage AD sampled values, [S2] is the second voltage AD sampled values, and Gain is AD sampling gains, DMAXFor maximum duty cycle is counted
Value.
4. as claimed in claim 1 for convertible frequency air-conditioner without bridge passive power factor corrective APFC systems, it is characterised in that
The signal processing module includes the first processing units of the output first voltage signal and the output second voltage signal
Second processing unit.
5. as claimed in claim 4 for convertible frequency air-conditioner without bridge passive power factor corrective APFC systems, it is characterised in that
The first processing units are specifically included：
First resistor, one end of the first resistor is connected with one end of the divider resistance；
First amplifier, the in-phase input end of first amplifier is connected with the other end of the first resistor；
Second resistance, the inverting input that the second resistance is connected to first amplifier is defeated with first amplifier
Go out between end, the output end of first amplifier exports the first voltage signal.
6. as claimed in claim 5 for convertible frequency air-conditioner without bridge passive power factor corrective APFC systems, it is characterised in that
The second processing unit is specifically included：
3rd resistor, one end of the 3rd resistor is connected with the other end of the divider resistance；
Second amplifier, the in-phase input end of second amplifier is connected with the other end of the 3rd resistor；
4th resistance, the inverting input that the 4th resistance is connected to second amplifier is defeated with second amplifier
Go out between end, the output end of second amplifier exports the second voltage signal.
7. as claimed in claim 6 for convertible frequency air-conditioner without bridge passive power factor corrective APFC systems, it is characterised in that
The power supply of first amplifier and second amplifier uses single positive supply.
8. as claimed in claim 1 for convertible frequency air-conditioner without bridge passive power factor corrective APFC systems, it is characterised in that
The PFC inductance connections are between the other end of the AC power and the second end of the rectification filtering unit.
9. as claimed in claim 1 for convertible frequency air-conditioner without bridge passive power factor corrective APFC systems, it is characterised in that
Also include：
Current foldback circuit, the current foldback circuit is connected with the current sampling circuit, the current foldback circuit according to
The first voltage signal and second voltage signal generation protection signal are input to the first switch device and second to turn off
The pwm signal of switching device.
10., as claimed in claim 9 for convertible frequency air-conditioner without bridge passive power factor corrective APFC systems, its feature exists
In the current foldback circuit includes：
First comparator, the positive input terminal of the first comparator is connected with reference voltage, the negative input of the first comparator
End is connected with the output end of the first amplifier；
Second comparator, the positive input terminal of second comparator is connected with the reference voltage, second comparator it is negative
Input is connected with the output end of the second amplifier, the output end of second comparator and the output end of the first comparator
It is connected to export the protection signal；
Over-current protecting unit, the output end of the over-current protecting unit and the first comparator and second comparator it is defeated
Go out end to be connected, the over-current protecting unit is input to the first switch device and second switch according to protection signal shut-off
The pwm signal of device.
11. as claimed in claim 10 for convertible frequency air-conditioner without bridge passive power factor corrective APFC systems, and its feature exists
In the microcontroller is also connected with the output end of the first comparator and the output end of second comparator, described micro-
Controller turns off the output of the pwm signal according to the protection signal.
12. a kind of control methods without bridge APFC systems for convertible frequency air-conditioner, it is characterised in that described without bridge APFC system bags
Including PFC inductance and the alternating current for the AC power to being input into carries out rectifying and wave-filtering to export the galvanic whole of predeterminated voltage
Stream filter unit, current sampling circuit, wherein the rectification filtering unit includes first switch device and second switch device, institute
Control method is stated to comprise the following steps：
The electric current for flowing through the PFC inductance is sampled by the current sampling circuit generate first voltage signal and
Two voltage signals, wherein, the current sampling circuit includes current transformer, divider resistance and signal processing module, the electricity
The armature winding of current transformer is connected between the first end of one end of the AC power and the rectification filtering unit, described
Divider resistance is connected in parallel on the two ends of the secondary windings of the current transformer, and the signal processing module is electric with the partial pressure respectively
The two ends of resistance are connected, and the signal processing module is processed to export the ac voltage signal at the divider resistance two ends
State first voltage signal and second voltage signal；
Direct current to the predeterminated voltage is sampled to generate DC voltage sampled signal；
According to the first voltage signal and second voltage signal and the DC voltage sampled signal and DC reference voltage
Generation pulse-width modulation PWM signal is controlled with to the first switch device and second switch device.
13. control methods without bridge APFC systems for being used for convertible frequency air-conditioner as claimed in claim 12, it is characterised in that described
Generation pwm signal, specifically includes：
The first voltage signal, the second voltage signal and the DC voltage sampled signal are converted into the first electricity respectively
Pressure AD sampled values, second voltage AD sampled values and DC voltage AD sampled values；
PI controls are carried out to the difference between the DC voltage AD sampled values and the DC reference voltage to obtain the first control
Value processed；
According to first controlling value, the first voltage AD sampled values and the second voltage AD sampled values are calculated
The count value of the dutycycle of pwm signal；
The count value of the dutycycle according to the pwm signal generates the pwm signal.
14. control methods without bridge APFC systems for being used for convertible frequency air-conditioner as claimed in claim 13, it is characterised in that according to
Below equation calculates the count value of the dutycycle of the pwm signal：
Wherein, Count is the count value of the dutycycle of the pwm signal, VmIt is first controlling value, [S1] is described first
Voltage AD sampled values, [S2] is the second voltage AD sampled values, and Gain is AD sampling gains, DMAXFor maximum duty cycle is counted
Value.
15. control methods without bridge APFC systems for being used for convertible frequency air-conditioner as claimed in claim 14, it is characterised in that also wrap
Include：
According to the first voltage signal and second voltage signal generation protection signal, and input is turned off according to the protection signal
To the first switch device and the pwm signal of second switch device.
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| CN105527484A (en) * | 2016-02-18 | 2016-04-27 | 珠海格力节能环保制冷技术研究中心有限公司 | Bridgeless PFC circuit current sampling device and control method thereof |
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| CN108400706A (en) * | 2018-04-25 | 2018-08-14 | 华南理工大学 | A kind of high efficiency interleaved parallel PFC converter |
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